[vtkusers] extending vtkPolyDataAlgoritm

[Alexander MacLennan]

Hi,

I am getting the following error message when I use my own class that
converts from OOGL to a format viewable using VTK



ERROR: In
/usr/student/tango/maclenna/cvs/VTK/Filtering/vtkDemandDrivenPipeline.cxx,
line 692
vtkStreamingDemandDrivenPipeline (0x8073228): Input port 0 of algorithm
vtkPolyDataAlgorithm(0x8074588) has 0 connections but is not optional.

Its vtk compiled from CVS as of a few days ago.

Does anyone have some hints?

cheers

alex

Here is my class:



import java.awt.color.ColorSpace;

public class vtkOOGLtoVtk extends vtk.vtkPolyDataAlgorithm {
    private OOGLObject o;

    public void setOOGL(OOGLObject o) {
        this.o = o;
    }



    /**
     * Get oogl object in vtk format
     * Follows the pattern set by vtkPLYReader.cxx
     *
     * @param request
     * @param inputVector
     * @param outputVector
     * @return
     */
    public int RequestData(vtkInformation request,
            vtkInformationVector inputVector, vtkInformationVector
outputVector) {

        // Ape the stuff from vtkPLYReader until I know whats going on
        vtkInformation outInfo = outputVector.GetInformationObject(0);

        // Casting done with C++ example, not the best for java???
        vtkPolyData output = (vtkPolyData)outInfo.Get(new
vtkInformationDataObjectKey());
        output.Initialize();

        // Return value
        int result = 1;

        // Temp vertex holder
        Point3d v = null;

        // Temp face holder
        Point3i f = null;

        // Temp variable for testing number of colours defined for OOGL
Object
        int count = 0;

        // Boolean variable for checking to see if RGB data available ( well
HSV )
        boolean colourDataAvailable = false;

        // RGB values for points
        vtkUnsignedCharArray rgbPoints = null;

        // Temp variable for putting colour into table as rgb
        float[] colourComponents = null;

        // Test number of colours defined for vertices
        if ( o.getVertexColours() != null)
                count = o.getVertexColours().size();

        if ( count > 0)
            colourDataAvailable = true;

        // If there are vertex colours then use RGB Points
        if (colourDataAvailable){
            rgbPoints = new vtkUnsignedCharArray();
            rgbPoints.SetName("RGB");
            output.GetPointData().SetScalars(rgbPoints);
            rgbPoints.Initialize();
            rgbPoints.SetNumberOfComponents(3);
            rgbPoints.SetNumberOfTuples(this.o.getVertices().size());

        }
        // Don't worry about colours by face for the moment.. its not
important
        // to implement this right now

        // Now load vertices into structure
        vtkPoints points = new vtkPoints();
        points.SetDataTypeToFloat();
        points.SetNumberOfPoints(this.o.getVertices().size());

        for ( int i = 0 ; i < o.getVertices().size(); i++){
            // Get the vertex values and set them in the point data object
            v = o.getVertices().get(i);
            points.SetPoint(i, v.x, v.y, v.z);

            // If colours available insert them, converting from hsb to rgb

            if (colourDataAvailable){
                colourComponents = o.getVertexColours
().get(i).get().getComponents(ColorSpace.getInstance(ColorSpace.TYPE_RGB),
new float[3]);
                rgbPoints.SetTuple3(i, colourComponents[0],
colourComponents[1], colourComponents[2]);
            }
        }

        // Now set the up the faces
        vtkCellArray polys = new vtkCellArray();

        // Allocate space for faces
        for (int i = 0; i < this.o.getFaceCount(); i++) {
            // Get face to insert
            f = this.o.getFaces().get(i);

            // Tell ca that next cell is a triangle
            polys.InsertNextCell(3);

            // Insert point reference values that
            // make up the face
            polys.InsertCellPoint(f.x);
            polys.InsertCellPoint(f.y);
            polys.InsertCellPoint(f.z);
        }


        output.SetPolys(polys);
        output.SetPoints(points);


        return result;
    }

}
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